Map imageQuality/imageCount and output_format across the HTTP and
WebSocket handlers, pass them into the design service calls, and register
the layered document generator in the service context.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Propagate an optional imageName through the agent content pipeline
(frontend types → API → domain → prompt building) so reference images
render with their name instead of a bare "image" label.
Also switch PromptComposer to submit on plain Enter (Shift+Enter for
newline, IME-safe) and add a submitDisabled guard wired from the canvas
and home composers.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>